短語詞組短語a difficult technical problem 一個(gè)難題difficult point problem 難點(diǎn)問題difficult technical problem 技術(shù)攻關(guān)difficult theoretical problem 理論難題solve the difficult maths problem 解決睏難的數(shù)學(xué)題solve a difficult technical problem 攻尅技術(shù)難關(guān)so the difficult technical problem 懸而未決的問題Joseph Needham 's difficult cultural problem 李約瑟文化難題big and difficult problem 老大難;老大難” 返回 difficult problem